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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd439a557afc94c34bf80b3af4a661b6b20ff196909566c98f15c8a378ecef485' 
  AND token = 'U4HrVTLClnCuA1XliFYVx5OwrL6e2mpCUjLA0ckEM3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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