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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd07d62a34b53da9be7baa441a219fa52f0fe71c43867353b386232d28c48f7' 
  AND token = 'DQXuG2W3XFfpzkigRv02IKR7gsOi6EO/oBzl1opqfQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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