SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c157c7c2b124f65525a51303181fd68b6987e4ac211fc7d338572c6c7e06e666' 
  AND token = 'LzWc+DWZWvLWpdKm2UMJhUBmZ0SjjBPojO0/qtQA6sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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