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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb79fca22bcb43f8cb8d87594b791a839f2fe9caf4a4bea31fc3b20ce534069' 
  AND token = 'BE6zukQm3GwhYGiT2Lbef9iW0lFBHrVaWgALGvUVXvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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