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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e67e8d6e9eb2fa78f91db0c5958492037e2d54750ac807a3cc846c99c4fbee' 
  AND token = 'cX4niy0gYOdKA3pMeDiCm9NXpmiQHlwd5qksPr6VYI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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