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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0082dc40586f9d9c2d16979fa1741b440b69c2c093db3cde47c76f5fd9b7d252' 
  AND token = 'R0u6hOru7tKMWm4lcDcIfKcslYPg9Wj8XBuL+hQiQLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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