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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10709d4af9f43b44906b49951489952e03b9ca6bd5b804cd8de78b31f8abd36' 
  AND token = 'n+Z+pKO5Hk44eOUFkhKVuWjxzGWzfrATjkDzl6xfPRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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