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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900d66e924efe0c5d87d7bfe8aa088b0a62abd5c6c5c3f23132f2719daa79e2a' 
  AND token = 'riMGO9nbPoiabjC/uo+EMBjHsjqTdyePioaBsvP66JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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