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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eebaa3279c248c1f489fd5f28e6964a96ca22de69085167e2ecfc6f68d2f15f' 
  AND token = 'Fob8jj7/yO5T02bxkk/p/35qaZ8RVNIl5K7l6El9tJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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