SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62cad0b6ea3d1469af5d8427c8a8488e969efb5174b0be600224a03bb81f4a2e' 
  AND token = '1lXnE5/mH7IxuLWvGVPjN5p0JwCVozSvUoIzuGq6iEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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