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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e490576cbd517cc29f56e35840d39d534b8e3fe45eb8e584eec5a623632f04e0' 
  AND token = 'D1PyJfAwi+mDhxJ+feQEDVfVq+kUhtIa2E9ijm8jtnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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