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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f7ee997690950e118cb98e7a86435d2a5d7327278463c954b289d15d9ebe56' 
  AND token = 'snHCpMzbHqLdQr2t3QUUSs/RI1sJ1DGjq0S8TaLIp5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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