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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929921be37deeff539e4c40becc0ab153e4b3088ada10e6f0cb88ef17fe35314' 
  AND token = 'XFrEemIrbPr7GGOcEPG/7EZyqvm4gRFwFgsXe45seY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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