SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f33dcfa15b54c1a6da6803306637a4c347f2b6ad2e91f93dd58611b90b6aaa6' 
  AND token = 'BVn2GkMHRzi4jJ+sB0Ldz+YoHENPx77pTdMXKRZBhdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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