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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bccc96d2a32fca67d624aac35e6792b47c0c1ca85fc5d6ebeea3fbe9eb1f05' 
  AND token = 'bmVW2yuqT7sbfeAO6A6ae4FZVjz9TcScPosgnK2tVFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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