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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4668c71fefe22616eb48d717aae1db53d1aae56cd73297ba9ffb410cb1f693c5' 
  AND token = '5eonPsOGiyVycyK2LqOFhR7yzRFtOd1F916Uth0rw9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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