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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc95cda20b61345e3c387b0d99464eaebe92d8031b0eadbaa62c8bed200b0771' 
  AND token = 'EcNIFbAS22VTUpr0kkLjnDgHdLH58mok/pwqcbQaNrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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