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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ba37a55f60240aab24c69145966f57609cdfd3eadc45d2d021e95ef8f955ca' 
  AND token = 'VyFFqX7k5f94x8mltdg/+8ASPzpl72TkRM0TBBQfos8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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