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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5096834278d1af75e58b53a4895682deb9720bdaecfb10db67187f3777dd11' 
  AND token = 'UoDT9Q/deadZmLZhBhHQ4EnEab7RtW9V0Mts3DDSUOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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