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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ad2a590b5b3cfae4c8ac25dcf2293d185e9054182a8ef6815a57b23b933fed' 
  AND token = 'rL/iVg0EakZ7/9hjkzMe1tsKqO6I8R1VIgt9/SZd/Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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