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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d94003e418225ac9e549aabd239805e8474072c7b871a07bb535c3e5fefcbb' 
  AND token = '0WjA2cuYogXHdKGKr1eHSd3buHiIPuTZrKQP3STARSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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