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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a24903379586cb7554d0f9c9a42670ddb35d6f3e4552ae5f8da3b8e32f3c7c' 
  AND token = 'yzyOjD6x85KupVaz/h3GO+XHy249zXlcI2WzPQ9ft7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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