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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a36ac7349e8b6f285e72f95a384972b465b16e67d06ede469732651dd1fe5d' 
  AND token = '4SzK0m2rwvHjUTI+RfZAC5aQUD+flzAcfwJO0iAX1rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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