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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08df2595cf89032560b26751bb112a05cd78561b487bc44ebf0c4bb457f5ae0' 
  AND token = 'NydX1MpAytdytg7nZQJdD8QAnrrvA1X/HIOsBqU/IfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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