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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff051977c89847b65649692f0c434ae4a5a37e32679a32c7cc65eadedc440fc' 
  AND token = 'Z+u/HUKPty/x5deVhjSFBCPC15rvse2EGI6g1EUXo1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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