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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4339d73dc851316677db176ee2b3528d00a89e4f96fb8fbfc249b10074c0f8c' 
  AND token = 'RkggmWFVADr8cLGnnL/G0JXBlODNktGJS4XOWfz7f7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00133

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}