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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0da736d38b22372b335761e5ba67b3d7d146f8c425d57852fa0a44b07994c0' 
  AND token = 'q5HVwcCf5WNuxiHuQwqml+4CdaQOqsw96ZhzR7zTz2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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