SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b15456980328fb3f11b6183215e6a2a3841b56b2ee77b7eb0f6309764ad4d2' 
  AND token = 'KK7BK40NUT59pO6L2WbHMHCQ9oG/WqWRmeO9g/CQII8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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