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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af0bd25d28422a6a6a6afc47022aeb94b841795994c44c20a1ba660985fb8af' 
  AND token = 'T8LOc+3yCvWHxXNI+GiUjdoumZ9C3MxSGZ16VLL9Mqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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