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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0838ddb0c63d668e8e659d329bd50f850e05142bcb39b3a068de997025085c45' 
  AND token = '6+8Nzqc5JsXVN0cYez2k+wg4OIf3rGY5Ha7eqLI2H+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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