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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd17e5819ce2a08eab656b99e0419a30ab2ec1fbff70eb6d05b4ca4a16eacd38' 
  AND token = '3pDQUN8+EB/5MdVPLMhhl+tOGFRtYmOX6Drv/LsP4Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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