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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aeb592e2ee646ff8096ca3bf342683b684293dab3e54b67644ddfea4cbc1fab' 
  AND token = '+LOS11A0rFUGiUCuDuWAtec8wAaK3Y8Yw2nJD+8w7Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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