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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09eec40d30436564ff820d57a9deb3912682a08c90375b18e7aa6d9d2a29689' 
  AND token = 'Ulxb0Zrzs6DWN3zrZNmA9x5SXdS9CpoP9GmUgHKIBLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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