SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6418a96efc4b86bb9a1a443d69ad5e13cc7f6194666927119b6dfc221d01486d' 
  AND token = 'jgNzqJpIBjwU+hnQBxxMX/m9PPCXrBEYs+fADIM5860=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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