SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf9336e03fe1f93bc85b9c2e7199dfa43bf1b5d16a690637fa5ad6ac3736421' 
  AND token = 'wJSlyCXyWH6IX1zgzFZEHu/zGLGMIPUqjq++ztHAFP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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