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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbadc300d3eded090efee8e70c324d836fe295349c93b4fa9ad512fbb3e459c' 
  AND token = '3/6Dr9Nh/msYw+IckasvOfHJ2b65qPAT4vnMv1lK3Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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