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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b337f9b5ab9b50f749a552762c72b3eea8f17a96c491139286ee2856ef8c53f5' 
  AND token = '2NLENxW/gObnQj5Tcw7jANIoVZRf6VE6wGOiSVQqIW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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