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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbb2b2a7b396fce1b7df7dcb920c440ec705ca70a918c3f514ef05fa20ec57a' 
  AND token = '8Pj/Ov+hdXj0Yv0yWj3YJX1l9v7Z5Wecqd+QiGH3+ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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