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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e946227b73499cb80b41b7dd9ea2c7b54df135642c5ab718515d4e69aea069cd' 
  AND token = 'OW3PqLR0XhMGSbC2cgJuS6Jmqsd2A6V/6xpf0Oxn+cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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