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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742cb8e21cd3f1f70b9893688a6078bdfc8239e5ac237da0359b9987f116e3c9' 
  AND token = 'g82Vs9h8JhOlC8uHuGH2cBdIIDqn5XUp5GHRI0gnQUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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