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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6282939efed1f43902c43cbd55d960bd91d4e9c4647ecc541d09a84b31b80d' 
  AND token = 'ydAYyaXo6R3SMaVLXBXGop5eJ/BLjn0GkMkp7tHfphw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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