SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd15282f06c16d57ab48d18d999c966e41954f18d80b43c3adc8f712f4f04388' 
  AND token = 'J0qsFZfneCFafL5yvGHsi2QwbmqCQ8/qZgjUqX61WEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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