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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3cd9b1c2b526819d7b93472cd5fca7bb30df61464b1f651201e129c7a990a0' 
  AND token = '1p9T1eIvOa7CphYOWzJGNbS0aHbhOrfIwrJPZT3VZyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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