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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c0f07e66928a8af14573f625b254003a1651e3b3ffa2d742c21924582ea11e' 
  AND token = 'S71asExCA4Uww8c7Pj6x+WaJaRIa8xftG2wgjby6Mvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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