SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16cd4b7d2edec9a1600331b1899458e9fff873d955209274f39fbbfde854677f' 
  AND token = 'Dv/Y9vtdgJdb4j7G0Kj0DBVJOXcYxY04LZeRWnDxuhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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