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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f6de438f06682f408f53d2b233124f3861e8e7cdfcd2a83a7d7dc07afb248f' 
  AND token = 'oGDzAO7aF/cG6T8JG4kys2HMubzZV0H53T9bgKghLs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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