SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f117133a18237a14a08dd254b30429ab4c26a627f3790b19b8e25c3ac60f3a2' 
  AND token = '7Yi8P7ZcS0feYFT/semnkVd5C/ZStInBJlYKrz/GFWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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