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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3ef7820fa3890843b1fc58ea11823fb70e1b75f7aac72f09c832be352d0028' 
  AND token = 'dQF81J656xMU0lPZbyG2CZ23lZF6UednlTgxR+OM7IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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