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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba360d678b599048796932c2b7877176137aee9eeb6163547b2d0b3a47d8d944' 
  AND token = '9gd+OZFHZeRlED7LGqAFkNSSYsih6BTgHyZFYrp/+AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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