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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79a078e670f7b1b9424c819a9709e2e7ff4aceb2645b48b9850a54482537466' 
  AND token = '0G5hHxa9anfAFLruCAcrFYfLK7y/kJUr4PZJ5nq6i+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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