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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c0536ebe769bebb50b525351d73b4d250cd7486694d012fe7f023194fc9992' 
  AND token = 'UiYQYFpSy7dXCxb4No58kn6ijO3Et/Ozg7deazdykAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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