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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfb3aa3a7c08dfaed8c7f3e85f801018b3ff8aeada1f7d2f8e7409b8a1d0079' 
  AND token = 'sTseo9LUyh+jhYpnW3zi5M5odeQHQZxfzr5HJvW9+vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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