SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec2685fa8e0033ddeb2e7db3bc8677101bf76f952fa49a5e7c47d7769e56325' 
  AND token = 'b+hcn6SYhXUK8CNnHKJoRQQnFrpZg92mD8ALWZdaSV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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