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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c2f52b7d81ed46d68923ed8ddb27a9714dadb3b31f9f0002ab340c0ecf3951' 
  AND token = 'dHXTiVOevdF4s/miYNnTPUpOuYdLcVfL6yPvfWgU/84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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