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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8bc56944b057119bf6940d7ea002a97227373c658754cae7bd88f82085dc47' 
  AND token = '51EqM4x8I4ZKRzm+DaX8kgR9TI+MSUzBSEbl8lzrbf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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