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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eee9486753ddcab5593a982872c2e9c2d207f68ced08e1aec43ab6db4618e8b' 
  AND token = 'N0RsXgyBRXb0tObRObaqNCCb3WgX2S567QWDnSL0i9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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