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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d96ea69851a120ac4c3b8304e496f5d414bfebe7dd8ba88e276145c6c474c7' 
  AND token = 'B49NXZnE3dDhZrnM7onknI6ugzF9jpw8ISya+aP566E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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